Electric furnace



J HERLENFUS.

ELECTRIC FURNACE.

APPLICATEON FILED FEB. a, 19W. 1,338,631 a Patented Apr- 27, 1920.

'2 SHEETS SHEET l- L, HERLENEUS.

ELECTRIC FURNACE.

APPLICATION FILE!) FEB-8,1918. l gigg ggl Patented Apr. 27, 1920.

2 SHEETS-SHEET 2.

Uld

JONAS nnmsmus, or :ee

rim, or new FURIELFLCE.

Application filed February 8, 1918.

To all whom it may concern Be it known that I, JONAS linnrnivios, a

subject of the King of Sweden, resicing in tain new and usefulImprovements in Electric Furnaces, of which the following is aspecification. 7

My invention relates to electric furnaces and particularly to animproved mounting and feed mechanism for the furnace electrodes, theobject of my invention being to provide a mounting such that theaperture through which the electrode projects into the furnace may besealed against air leal age without interfering with either the feedingor the tilting of the electrodes, and also to provide a feed mechanismor improved type.

In the accompanying illustrative drawin s,

T igure 1 is a side elevation of an electric furnace in which myinvention is embodied in one form;

Fig. 2 is a broken plan of one of the side electrode mountings; and

Fig. 3 is a vertical section through this mounting.

lhe furnace here shown is oi? the type commonly known as the Rennerfeltfurnace,

the body 10 of which has a top opening for the entrance of a verticalelectrode 11, and two side openings for oppositely disposed electrodes,only one of winch, 1:. 1s

trated. T he furnace is provided with a.

eral pouring spout 13, and is supported on semi-circular bearing plates1 1, which rest on rollslfi journaled in standards it? on masonry base17. lnasniurn the'present invention is particularly concerned with themounting and feed of the side electrodes, it is unnecessary to gofurther into detail in regard to the general furnace construction.Moreover, since both of the side electrodes are mounted. and operuted inthe same manner, it sulhces, for the sake of fiflplttnlblflli, to showand describe one of these.

Referring to Figs. 2 and 3 where l have illustrated, on a large scale,he mounting for the electrode 12, it will be seen that the latter iscarried in a water-jacket sleeve 18, the flanges 19 on which re 'isterwith cooperating flanges of a clamping bracket 20, se cured thereto bythe bolts 21. Integral with specification of Letters Patent.

Serial No. 216,013.

the bracket 20 are electrode supporting arms 22, terminating intrunnions 23 journaled in bearing flanges curried by a side )late 25,riveted. the shell ofthe furacc 10. This side plate 25 is apertured at26, in register with hole in the furnace wall, to permit the passage ofthe electrode 12 therethrough into the furnace chamber. lnasmuch as theelectrode is tiltable, this aperture must have considerable clearancearound the electrode to permit it to assume its various angularpositions. Ordinarily, considerable air leakage into the furnace chamberoccurs at this point and constitutes an objectionable feature which 'hasnot hitherto been overcome, so far as I am aware. I have provided a.packing for the electrode at this point which prevents this air leakage,and at the same time, neither obstructs the angular movement of theelectrodes nor their advance during the operation oi the furnace. Ashere shown, the packing 27 is in the form of a non-conducting,heat-resistingu'ing of any suitable material, such as asbestos fiber,which is held by reining-ring 28 on the water-jacket 18 in a p anecoinciding with the axis the trunnions 23. The retaining-ring 28 may besecured to the plate 25 by screw bolts 29, so that it holds the packingin fixed position. Owing to the location of packing ring 27, there isobviously little or no movement thereof when the electrode istilted,;and such yielding thereof as may be necessary to accommodate itto the swing of the electrode is taken up by the elasticity of thepacking itself.

in order to feed the electrode forward into the furnace as it isconsumed, l clamp thereto at 30 a rack 31, supported by slides carriedby a long spur 34 extending outward in the direction of the length ofthe electrode from the lower portion of the writer-cooled sleeve 18.Meshing with the rack 31 is a. pinion 35 on the spindle 36, at the outerend of which is a worm wheel 37 engaged by the worn'i 38 on spur shaft39 fast with the bevel pinion 40. The latter meshes with acooperating-bevel pinion all carried by spindle 42 driven through shaftl3 and universal couplings 44: from the electric motor 45 mounted on abracket 4-6 secured to the furnace shell. The universal couplings 44make it possible to feed the 4 nace and provides a predetermined gradualelectrode 12 forward when the electrode is up-tilted' as indicated indotted lines, in Fi 3. l

- fnstead'of using a stationary motor with trodes are somewhatlighter-and even for the large furnaces, when possible.

The motor 15, in either event, runs continuously din-111g the operationof the furfeed of the electrodes into the furnace chamher. If desired,the speed of the motor may be controlled at will throiwh anv suitableregulating device. In furnaces of automatic operation, a motor feed ofthe type described is a very desirable feature.

The top electrode 11 is clamped at 4:? to a. rack 48 which takes itsmotion from a p' ion (not shown), operated through a w gear 49 from theshaft 50 through the hand wheel 51.

The side electrodes are tilted on their trimnions 23 by means of a handwheel 52- on screw rod 53 working in tapped bosses 54 on spur 34 andhearing, at its inner end, against the plate 25,

Various modifications in detail of construction will readily occur tothose skilled in the an; without departing, however, from what I claimas my invention.

I claim: a

1. An electric furnace having an apertured side wall, an electrodeprojecting with clearance through the aperture in the side wall into thefurnace chamber, a pivotal support for said electrode exterior to thefurnace shell, and a flat packing ring surrounding said electrodesubstantially in the plane of the pivotal axis of the electrode supportto prevent leakage of air into the furnace chamber through the electrodeopening in the side wall thereof.

2. An electric furnace having an 'apertured side wall, an electrodepro'ecting with clearance into the furnace cham er through the aperturein the side wall, a pivoted trunnion support for said electrode exteriorto the furnace shell, a fiat packing ring spaced from the electrodesupport and surrounding said electrode exterior to the furnace shell toprevent leakage of air into the furnace -a retaining do chamber throughthe electrode openii'ig, and engaging said packing ring to hold thesamcin per "rion.

3. An eleris furnace ing an apertured side wall, an electrode projectingwith. clearance into the furnace chamber through the apertured sidewall, a water jacket surrounding said electrode and projecting into saidaperture, a pivotal support in which said jacket ournai-ed to permit theangular displacement oi" the electrode within the inrnacerhamher, a hitprut-king ring engaging said water \Qi. at said i'ipcrturo but spacedfrom the "I support and serving to prevent lea To the furnace chainherthroi opening, to-

' device engaging said gether with a 1 in position. (ingan aperparlringrin therechamber, and i electrode into the d means connjirising a heeleiittroac, :1 pinion incslr an Fectric motor and an ing with the raoperative con r the pinion r1 trode at p 5. An ele, tured side w,through into means for f furnace chamh p s con'iprising a rack clampedto electrode, a sleeve through. which the electrode passes, bracket onsaid sleeve and motor elements mounted on said bracket and oper: vivelyconnected to said. rack for advancing the electrode.

'6. An electric furnace having a side electrode, a sleeve mountedthereon, a spur on said sleeve extending in the direction of theelectrode length, and feed mechanism carried by saidspur for advancingthe electrode into the furnace as it is consumed.

7. An electric furnace havinga tilting side electrode, a sleeve mountedthereon, a spur on said sleeve extending in the direction of 2d speed.inane having an aperelectrode passing therechamber, and

the length of the electrode, and a screw rod" In testimony whereof Ihave signed my name to this specification.

JONAS HERLENIUS.

lectrode into the

